Anti-skid control braking system for four-wheel drive vehicle wi

Details Anti-skid control braking system for four-wheel drive vehicle wi Anti-skid control braking system for four-wheel drive vehicle wi

1998-08-11

1999-08-24

Oberleitner, Robert J.

Fluid-pressure and analogous brake systems

Speed-controlled

Four-wheel drive or all wheel drive

180244, 701 81, B60T 832

Patent

active

059416130

ABSTRACT:
In an anti-skid control braking system for a four-wheel drive vehicle with a feature of determination of a road wheel drive state according to the present invention, a determination of an actual drive state of the four-wheel drive vehicle, namely, a determination of whether the four-wheel drive vehicle is running in a two-wheel drive state in which a driving force generated by an engine via a power transmission is distributed through a transfer only toward mainly driven road wheels (rear road wheel pair) or in a four-wheel drive state in which the driving force is distributed through the transfer toward the mainly driven road wheels and secondarily driven road wheels (front road wheel pair) at a predetermined distribution ratio is based on at least one of front and left road wheel speeds (V.sub.WFL, V.sub.WFR, and V.sub.WR) which is detected for the rear road wheel pair without installation of a special-purpose switch (or sensor) especially used to detect the drive state of the four-wheel drive vehicle. In an embodiment, a variation rate (V.sub.WR ') in the rear road wheel speed with respect to time is monitored to determine the actual road wheel drive state.

REFERENCES:
patent: 5249849 (1993-10-01), Sakata
patent: 5586815 (1996-12-01), Negrin

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